Equity-based Compensation - Schedule of Share-based Payments Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Compensation, Share-based Arrangements Rollforward [Roll Forward]
Balance, beginning of period	$ 386.1
Balance, end of period	221.8	$ 386.1
Cash Settled Awards
Deferred Compensation, Share-based Arrangements Rollforward [Roll Forward]
Balance, beginning of period	386.1	188.8	$ 53.7
Amortization and revaluation of granted awards	45.1	199.9	135.8
Repurchases (cash-settled)	(209.4)	(2.6)	(0.7)
Balance, end of period	$ 221.8	$ 386.1	$ 188.8